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Layered Transition Metal Oxynitride Co 3 Mo 2 O x N 6-x /C Catalyst for Oxygen Reduction Reaction.
ACS Applied Materials & Interfaces 2016 November 3
Transition metal oxynitrides have now garnered growing interest in our quest for highly efficient alternatives to Pt in direct methanol alkaline fuel cells. Herein, carbon supported Co3 Mo2 Ox N6-x was synthesized via a simple two-step approach wherein the reactants undergo refluxing and heat treatment in NH3 . For the as-prepared Co3 Mo2 Ox N6-x catalyst, uniformly dispersed on XC-72, with the particle size averaged at 5 nm, the catalytic activities toward oxygen reduction reaction in alkaline media are related to the commercial Pt/C, such as the comparable onset potential (0.9 V vs RHE), half-wave potential (0.8 V vs RHE), and even higher specific activity (82.7 mA cm-2 at 0.7 V). Significantly, the Co3 Mo2 Ox N6-x catalyst was highly stable in terms of 95% current retention after 12 h chronoamperometry measurement, indicative of favorable prospect for the non-noble cathodic catalyst in alkaline fuel cell.
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